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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11f749d3cca7fb8a9fb8f3e2060134f77fce2f2247e9346f8f4db00fc7ddb6f' 
  AND token = 'Gp+riaCFmuB7bThdHpfdeJjp9dJM5VhOXccZ2LJs5y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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