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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd804a3e6d869246dd6229e3d793561dc7032f3f14c94da2628cc1acdfb1ab4f2' 
  AND token = 't5ymxrRmKv6ojuo54pONWqXQ4D7CClVu3fcEVVzBJB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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