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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276f7434e9863164b25f64041d91974ddfde182b3344939982d695e506ec8ea2' 
  AND token = '4SHK9LWZrRdHEAOW5FTxAJLRY7YRcjpqd9kzb7fZhP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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