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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdd862ac27e7e4ea0e4f8a6bd31e7cb0388f78ed927e3c16b226b735e2a35b3' 
  AND token = '7OoyJGJwqMHVt6wqFVvSMqTxKwGKoLE9hhcqrLyzkdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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