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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01cfc549c62d24ccfdf0b272740082b150bba74fa9278fc231fa5a7acf35ea4' 
  AND token = 'h9OYLg8zjagRheEGcDaUGnV2z70fGjNEax9+bEgQ4qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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