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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810482f183b9f863dddd93efa903be6dd62c5c06ef2ba19165a8b122d8dbc95c' 
  AND token = 'c6jFcE1Y3+odBCUnNB8Bb1znwmAILsN2dJhktr+7qwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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