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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4d80ffb24e24bb9d5c2e998ba89bc2d556b7b4336f0ea150074a281ed584d0' 
  AND token = 'HCMAw+WkOl2YGa7xQ6uQfp6ZkQUL92NHNAwKVRWot6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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