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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33b85e5fdf96fd5e947ceba4a2fd334dc1a7514954b919a3508753dda998d65' 
  AND token = 'yruvoidlQq8aE6IQTSC73ycyL1NW7ueHnZjwJ9XdwcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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