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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b625ae882675ed1c062028d3dc6eadeada03e7b3c888490fff69e9ead4ffa19' 
  AND token = 'rmqphdR6So6gB82XH1Apc8eoHoMfk+QbfgTuORJgxvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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