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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed0de50ad2de1c909ab0a574a975e026fa03f9628fe6a2ddfeb2a9b0084e51e' 
  AND token = 'ShKGfGIpISqTxUl6EpTNpR95hh6rLFJjPhIx4qX1eK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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