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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35f5f81cb118b5b035e1dc8f04902c55b2bceed1edb61d3f1680f0a5c5a9273' 
  AND token = 'Zg44N4PX9QN8kgeSUSYyzZXk62eyadmZmh58cYgcnvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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