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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ca9d7f350465069788f7f3006df3973031da7cdebbac9cc4742bec735b38da' 
  AND token = 'Pgkeq8bQ2wqlThf6LiOnRjaqwEZ529o0Zgjm+RL98lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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