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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d833660f46fea52780171ac20729e83df5e737ffec9eb809155084d7d3da0ab' 
  AND token = 'rnx4srMIsGvoOnAfER2xDazkL5MzHCj0nKLRs+BB/WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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