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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892dbd2eed0642abc66215a3ecb834b5fae5472ef77f4f875dcf2e1e68c9b025' 
  AND token = 'Ut7bQ5E3JTbPVp9Otn+Tmo3/Kl+nMCDMXo4rsYPpwIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}