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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582a9d6ad2d67be4526503ba76faf7b12b1268eddb57a11e5061c09eb6880078' 
  AND token = '2n9SOtdRXKbuUXFcEjGQp1NHckgzTXrc5mpDBWwTtMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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