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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0e974322e3be4a7a0eb95540c58d52265d62800298c5575c1bdbb2ff3dcfe4' 
  AND token = '7WSLMSBI9L2GYH4bFi1FB1qzPQdlCO77kP7VVVcihic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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