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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ee4ff15d9afad5eb23e00e0cd1c9e9dac75c5c40ae88d54c712d2a734a75d8' 
  AND token = 'qaxK6y/IzmNTp9WJYhkgNYsF/vEfj2ilAijduV36DEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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