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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9ee1fa8e3d782ac21bcdd0822b9da6d1d3ff8882670d3151eda8325e4f99b2' 
  AND token = 'lrFsWutQDGIVtc5Ltn1LyZxv86VgVuFxpYU2uaGkw7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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