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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda28343891e11a3ef2c968a2f99d33ac9400aa43d1129ef1d832f22160192b9' 
  AND token = '9dRQDSo5JMO/bwLkXB67rlSTLVPQjJ5JNoGKpVaN2ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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