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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ae977cf9b68c58adf50894db56d7c4245a95d059c42edbed57e534e5d74184' 
  AND token = 'tcQCfy0hr8tCfQGd7pHKxkc8g7XiW2BhjcqWHHHGeBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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