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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1741be45f79e074fa5aaad4ec8af27472e6d8112e68d720b3eef7728db987e5' 
  AND token = 'i4siEvMno0dq2YXwO3iJBOuWp3DUZr+wp66v0othur8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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