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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb015e752c68e7bb6969119ba000e5b9f1130495ef3b2f2ec5329bf006c63822' 
  AND token = 'eCIezQEujyQciHnUdEUONbFRue5J49DV1v7zLN0W3l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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