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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7fa7e079bb0a9663a1e9f99d640260b0adea42185c700f10fb5d177a05fe42' 
  AND token = 'r0ILc2k6l4uQQZRa36PlhAYSrBP0nun4F/uxIx+YYMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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