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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e6366e70657d297d4e9a997111f1c47c8633f1ab09828ec548e7d78bd53e52' 
  AND token = '6fZ6Xfic7AiNrVaX6mWi8USe1zzeRdwWVpg/R6x5uCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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