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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0263b22aed01b6b29b409492bd8d3107aae586f8b799e33330efed0dfb31cc5' 
  AND token = 'GGvzz8OZqW7/xZuUUWuPYl976/kI3vn6ePd8LSCohLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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