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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e411939fb668b9948b2a6af732aa03c8221fb486095c804be27d5816cdecb2e3' 
  AND token = '6EC3skx79STCbNw4f6Es0bb8S4cSgClYXHbtW5wcPzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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