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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2a5a646946d9bafd4574d34f5daf53fdffd45ce1117b4a0e112664e048f233' 
  AND token = 'QDKpeO++6UTrG2+mcQwyQGQyTJfxtRhL94u6YN4K1Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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