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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd529d8ec74f899a8e9e537d2966891a14fd314829f5b1db3221ee6900698ee5' 
  AND token = 'Acxktn+svQaHDEnh/rPKFR+uHZEY0EKp8QVZ+feIqPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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