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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46137aa404e39b34681af135f5623ad230cf342b766cd9fdb062b17c5771fc9e' 
  AND token = 'd5uv4ZJA446GYb5YRozz+lflKK428UN6YaEyz4H8AM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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