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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c348e97ce9fd5ece058d9ba85d71952d788b717624f10bc31c4a1d6f472ae1' 
  AND token = 'Go2szugv/0UjB7RUb7QRsCxMnX7TGZZdyF1d2hAF0PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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