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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13773eac1bdd5beda02025448ffc40f12f4a9f178bca394d8ec989e23f82c9a2' 
  AND token = '5HpqVbe3pHEka6IBWL9iRNwPXIFpl69i4ZcN2f8Wz3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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