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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617b3b1570729a7befd2ec6601ba4cd9cf105298e38d1d14d8e81d5c12d8393e' 
  AND token = '3idAgO58bf/xlQMWruP50Sc2mHoEunbbP5I5uAvET/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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