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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2a5e4233e4609398b4d127eb2606a5de1a4f2735457d9565d2a4cb9dcd5fa7' 
  AND token = 'WBhveJ9ynNuyOf0Fjli/w9EC/GM+D13ZMLUtUTsMj6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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