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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4db05ec4c719d175b8f6ab2c64b79f906c0ed11eea1b1461d6f6c2a4039b2e2' 
  AND token = '4ktmKtgpvdC4I7nJ6x+dC67JH4CpTuCP2uqNk2uVItM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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