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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1046230b4d6b95cd16c507414ca2fdc7c76cc5dff0f61091245df76c5b96de9b' 
  AND token = 'DHbn1fIgK7er5o55m2jXEKcGBBMqkYw3bkXuj7kSsKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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