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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d98dc915b06fa8f6ebac1ff619a3c88f1ba05d30ed4bc5ff8ecd68b92000b31' 
  AND token = 'bgYTHqdlBnSZ7kTK7/DBJttHfby7LWBaY5SvC8W5Puo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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