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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7309e801fc41c58a562638040bf8045948166c086fafed8fb97c60b1fb4bfe' 
  AND token = 'W5OWQ7xOfacr1b2F6j85xv6qXEyNaEqBOy5Qtkd/2QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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