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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddef7b4cdd5543ab80e569519d8859cbb61e54c3dbd5c00da46407579a6138f' 
  AND token = 'ISOQfFKgpU7k7DwKLrkP1912egMqkAKpwcOwC3BgEP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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