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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25cb862a7f27023708938b8c58266d4bb71a934174ee988811fcd51e0d1f3002' 
  AND token = 'yF8fZuUTOWdNWW1efDgdC1RGdJMN9ic7rp48l3d8ZdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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