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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edca0ef73f52287758cacaba95abc9dd64068e5b2a36ebaa3b7e145e55066fe7' 
  AND token = 'TBP83H2bIkbOIqVU3FTZv6MTOCQqD1fZ4PBVxsg7xUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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