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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f10c13720b8590922a11bd9fbea138e635188fa8b90dae1648748e202883c2' 
  AND token = 'rb+eYTVvAuq+2zH8jR7oUouyd5ns7p1NYhLBEawusFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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