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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0bd20f6fd6f02d4d59bec9dfe2fa96c577e5e4d807e0df4aa7ebcdf07f848d' 
  AND token = 'XQIQgYZvjnpRQjK7g2f8oEK37maXBACJE+dfeMP7ka4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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