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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19daf4e2e5995c8206c4fa1057190ac6dcffa6c5e710ed0c896d42199f0a7e3e' 
  AND token = 'Nxq5oYeBTQtmeDdbqsLRwAaWH7Vs3pRNdehb9nUw51Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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