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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a5ab0599957d25d60b068330636e564e78b4f345906bce652be56f71937f61' 
  AND token = 'C9dUpvCkCP420B9gTTqUvIgb1yd12i+5Oh2xoKmxG58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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