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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b328f27a20805a7129356c61bc5812208e994390dab67abd20345146dadb4bbd' 
  AND token = '0mqovSozlcrjGKpherJz7Jcy8oM1UHuv8a9rnyoqZiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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