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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fdeb59851869c5ba7503d1c0cdcae4f07e6abd075c842b3c60746b89092ded' 
  AND token = 'DGe/006DFzn0dwFvkTXuglE1NVCrTytbm2YtKK6chs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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