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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ed75c62f3fdae612ce3525a3cfa0105cbcd07b066fa87e70ca2b31f559791a' 
  AND token = 'hAzRoytp/w/79YEUgPVKBHni8ggHN9RUEFRPw/XmbNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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