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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1071133465a1154355a10befe4701502555fbd0e5c804f713ca470f53db0a87c' 
  AND token = 'r9EUtSYCdW9sFs8o2i+82W2BLParJDjpVSZw9Yd00FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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