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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e532197b4f4530139daae9eba3db3885db1850e3ac0acaf9f12d75c9b7bfc3' 
  AND token = 'gbs4kZkIwysQCrLkxtdxqXU5GZzaVyr2wKmrB6DLBt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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