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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafc34fc14acb65e9ec935f34c57c5972260d36592db0addc50b201c91af91fa' 
  AND token = 'zoidAcRneSwY0lyncqDG6solwLLozwMfuZ9YU6gtE9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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