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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c9690d5b76978c545a773d2992a5f2ae7e9973a74928bcd25ee0cc159c88fb' 
  AND token = 'zjVzEiWzKgVKT0ABKnmiiO9c4o4wchMJsSUasWOzgbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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