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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f94cf41419d30e902100fd0880fb3c4810ef403c9e732e01ae14c6edbfe21e' 
  AND token = 'nD2lNzv+eM2OmCmNZvlKU+J2iLclZoi+fD4L0515bdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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