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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6874ed39c7b87d36d990e1828e869232a026cdb8e7cdbdb219f054fd029add' 
  AND token = 'rOjnDsYkJEEJ4+Z61z7dJP7eSveqTUu7x3mi1eoRyDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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