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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b5eecf733ce97183e5bf189a02b0b13bb6be6ed17eff31cb2335eddfba3e73' 
  AND token = '8PY2b0pF0Wn7ul2rBCNeV0GZT9IsphhSagPICM7TShw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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