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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c0ae21ef4a0eb66e3c2935233f93d08fa9117c46b06cc5eb0d67046c86592a' 
  AND token = 'uJjGAr8DTk/abyaNTdns+2kTe43UgHwD1EVBNU/mgOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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