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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb62e750f34fd44ade87f73c7a415d1328a744e290d9477aa6223b594fd9315a' 
  AND token = 'g1bApo5JBy+MDlkkItXDE4anW8Lfer/flnXzUXBdk6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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